Saturday
August 30, 2014

Posts by abby


Total # Posts: 628

physical chemistry
In an experiment, at a total pressure of 10atm and 400 degree celcius, the equilibrium mixture 2NH3=N2+3H2 the ammonia was found to have dissociated to the extent of 96%. Calculated Kp for the rxn. (reversible rxn).
August 14, 2014

math
In the diagram, the circle will be dilated by a scale factor of 3 about the origin. The points C, A, and B map to C', A', and B' after the dilation. What is the length of ? Use the distance formula to help you decide.
July 24, 2014

physics
A diver with a mass of 51 kg reaches a maximum height of 5.8 m above the water. When the diver has fallen 2.8 m from the apex, what is her kinetic energy (J)? Assume horizontal velocity is zero.
July 20, 2014

math
A woman buys a $ 78 necklace at a jewelry store. She gives the jeweler a check for $ 100. Because he does not have the $ 22 change, he goes to another merchant next door. There he exchanges the woman's check for $ 100 in cash. He returns and Gives the woman the necklace ...
July 10, 2014

physics
A mass m is gently placed on the end of a freely hanging spring. The mass then falls 21.3 cm before it stops and begins to rise. What is the frequency of the oscillation? I found the same question (with a different length) posted on here, but following the steps of the answer ...
June 12, 2014

Calculus
Compute the absolute and relative errors in using c to approximate x. x=e;c=2.68
June 1, 2014

Physics
A box is pushed down an incline from point A to point B by a force F (and also under the influence of its weight). The distance from A to B, along the ramp, is 5.0 m. The force F is parallel to the incline, as shown, and has a magnitude of 2.0 N. The force of kinetic friction ...
May 30, 2014

Physics
Two particles with the same mass and same initial speed collide and stick together and leave the collision with half of their initial speed, bound together as one particle. What was the angle between the initial momenta of the particles before the collision?
May 27, 2014

Physics
Two particles with the same mass and same initial speed collide and stick together and leave the collision with half of their initial speed, bound together as one particle. What was the angle between the initial momenta of the particles before the collision?
May 27, 2014

Spanish 2
Can someone help me with these two? Thanks! :) Directions: Re-write the sentences in Spanish. The sentences are in all tenses. 1.) Include a direct or indirect object pronoun in the re-write: He used to buy books for the students. 2.) We have eaten breakfast. My answers: 1.)...
May 20, 2014

statistics
A manufacturer ships toasters in cartons of 50. In each carton, they estimate a 2% chance that one of the toasters will need to be sent back for minor repairs. In a batch of 25,000 toasters, what are the chances that fewer than 475 need to be returned? The probability that ...
April 15, 2014

spanish - HELP!
Thank you!!
March 25, 2014

science
are these correct??
March 22, 2014

chemistry
1. How many different 4p orbitals are there? 2. How many radial nodes are there? 3. How many angular nodes are there? (excluding the radial nodes) I thought it was 2,1, 2??
March 12, 2014

chemistry
1. it takes: ____ electrons to fill the 6d subshell of an atom. 2. It takes _____ electrons to fill the n=6 shell of an atom. I thought it was 22 and 72?
March 12, 2014

chemistry
What is the velocity, in meters per second, of a beam of electrons if they are to display a "de Broglie" wavelength of 41.2 um?
March 12, 2014

chemistry
no, there is no diagram. they just say it: 8p1 is the orbital number. So n=8. but i'm stuck from there. Thank you for your help.
March 12, 2014

chemistry
What is the longest wavelength of light that can be emitted by a hydrogen atom that has an initial configuration of 8p^1? Thank you!!
March 12, 2014

chemistry
Thank you!! You are so helpful!
March 12, 2014

chemistry
What is (delta E) for the traansition of an electron from n=9 to n=4 in a Bohr hydrogen atom? What is the frequency? Thank you!
March 12, 2014

chemistry
What is the wavelength, in nm, of light with an energy content of (1.35x10^3 kJ/mol)? Thank you!!!
March 12, 2014

English 9 - HELP!
I wanted you to check my answers. 1. c 2. c 3. a 4. c 5. a 6. d 7. b 8. e
March 11, 2014

English 9 - HELP!
1. The small boat was scudding into the open sea with a full sail. (1 point) getting stuck sinking deeply moving swiftly rocking harshly 2. As an outdoor enthusiast, Kristina abhorred the fact that people left debris along the hiking trail. (1 point) recently discovered ...
March 11, 2014

chemistry
Given the following thermochemical equations, NO(g) + (1/2) Cl2(g) --> NOCl(g) -37.78 kJ (per mol NOCl) NO(g) + (1/2) O2(g) --> NO2(g) -56.53 kJ (per mol NO2) 2 NO2(g) --> N2O4(g) -58.03 kJ (per mol N2O4) what is the standard enthalpy change for the reaction below? ...
March 5, 2014

chemistry
What is w when 1.27 kg of H2O(l), initially at 25.0oC, is converted into water vapour at 133oC against a constant external pressure of 1.00 atm? Assume that the vapour behaves ideally and that the density of liquid water is 1.00 g/mL. (Remember to include a "+" or &...
March 5, 2014

chemistry
A 0.016076-mol sample of an organic compound was burned in oxygen in a bomb calorimeter. The temperature of the calorimeter increased from 23.7oC to 24.5oC. If the heat capacity of the calorimeter is 4.98 kJ (oC)-1, then what is the constant volume heat of combustion of this ...
March 5, 2014

Math
The area of a rectangle is 32 in.² the length is twice the width. what is the perimeter of the rectangle?
March 2, 2014

chemistry
A sample of gas is compressed from 13.57 L to 3.93 L using a constant external pressure of 2.91 atm. At the same time, 1,759 J of heat flows into the surroundings. What is the internal energy change for the gas?
March 1, 2014

chemistry
A 0.016076-mol sample of an organic compound was burned in oxygen in a bomb calorimeter. The temperature of the calorimeter increased from 23.7oC to 24.5oC. If the heat capacity of the calorimeter is 4.98 kJ (oC)-1, then what is the constant volume heat of combustion of this ...
March 1, 2014

chemistry
How do you calculate the volume on the left and on the right?
March 1, 2014

chemistry
The enthalpy change for the reaction below at 25oC is -2,051 kJ (per mole of C10H22). What is the internal energy change for the reaction at 25oC? 10 CO(g) + 21 H2(g) --> C10H22(l) + 10 H2O(l) Enter your answer in kJ (per mole of C10H22), rounded to the nearest kilojoule.
March 1, 2014

chemistry
The standard enthalpy of combustion of C2H6O(l) is -1,367 kJ mol-1 at 298 K. What is the standard enthalpy of formation of C2H6O(l) at 298 K? Give your answer in kJ mol-1, rounded to the nearest kilojoule. Do not include units as part of your answer. Note: The standard ...
March 1, 2014

chemistry
Given the following thermochemical equations, NO(g) + (1/2) Cl2(g) --> NOCl(g) -37.78 kJ (per mol NOCl) NO(g) + (1/2) O2(g) --> NO2(g) -56.53 kJ (per mol NO2) 2 NO2(g) --> N2O4(g) -58.03 kJ (per mol N2O4) what is the standard enthalpy change for the reaction below? ...
March 1, 2014

chemistry
When a 6.79-g mixture of methane, CH4, and ethane, C2H6, is burned in oxygen at constant pressure, 369 kJ of heat is liberated. What is the percentage by mass of CH4 in the mixture? The standard enthalpies of combustion for CH4 and C2H6 are -890.3 kJ mol-1 and -1569.7 kJ mol-1...
March 1, 2014

chemistry
What is w when 1.27 kg of H2O(l), initially at 25.0oC, is converted into water vapour at 133oC against a constant external pressure of 1.00 atm? Assume that the vapour behaves ideally and that the density of liquid water is 1.00 g/mL. (Remember to include a "+" or &...
March 1, 2014

chemistry
Ah! okay! But thank you so much for answering a few!
March 1, 2014

chemistry
Hello, a few questions: Thanks so much! 1. The heat capacities of titanium and water are 0.522 J g-1 K-1 and 4.184 J g-1 K-1, respectively. What is the final temperature of the titanium-water mixture if a 175.0-g sample of titanium, initially at 90.0oC, is added to 50.0 g of ...
March 1, 2014

Math
A line in coordinate plane contains the points P(2, -7) and Q(-4, -1). What point is the midpoint of PQ?
February 27, 2014

The Power of Media
Ok, #1 is Which of the following is an example of a print medium? a.) a blog b.) a newspaper ******* c.) a magazine’s website d.) all of the above
February 25, 2014

Is a blog a print media? yes or no?
Oh ok, thanks!
February 25, 2014

Is a blog a print media? yes or no?
Is a blog a print media? yes or no? I think yes it is.
February 25, 2014

chemistry
we're in the same class!
February 24, 2014

chemistry
A 33.0-L cylinder contains 481 g O2(g) at 22.5°C. What mass of O2(g) must be released to reduce the pressure in the cylinder to 6.16 atm, assuming the temperature remains constant? Thanks! :D
February 24, 2014

chemistry
Hydrogen peroxide, H2O2, is used to disinfect contact lenses. What volume of O2, in mL, or O2(g) at 31 degree celsius, and 741mmHg can be liberated from 10.0mL of an aqueous solution containing 3.00% H2O2 by mass? The density of aqueous solution of H2O2 is 1.01g/mL. Thanks! :)
February 24, 2014

Math ~ Need Help! ~
Thnx
February 24, 2014

Math ~ Need Help! ~
• 1. Draw a segment and create a perpendicular bisector using the geometric construction techniques. • 2. Draw an angle and create an angle bisector using geometric construction techniques.
February 24, 2014

Math! HELP!
Can you help me with some graph ones?
February 21, 2014

Math! HELP!
Reiny, Steve!! I need help!
February 21, 2014

Math! HELP!
For questions 14-15, find the simplified form of each expression. (3/2b^4)^3 (3/5y^4)^-2
February 21, 2014

Language Arts- Writeacher check again
#2. Which is the correct MLA citation for a magazine article? a.) Brian Carson. ''The Real Story Behind Big Foot.'' Myths and Legends Mar. 2010: 20. Print. b.) Carson, Brain. ''The Real Story Behind Big Foot.'' Myths and Legends Mar. 2010: 20. ...
February 21, 2014

Language Arts-check answer-
ok
February 21, 2014

Language Arts-Only 2 answers to check!
I just need #2 and #3!
February 21, 2014

Language Arts-check answer-
#1. What is one thing a strong introduction does NOT do? a.) capture the reader's interest b.) present evidence to explain the topic******* c.) provide background information d.) state the main idea of the report #2. Which is the correct MLA citation for a magazine article...
February 21, 2014

Language Arts ~CHECK MY ANSWERS~
Read the following passage to answer #1 and #2. April 15, Miss Kinnian says I'm learning fast. She read some of the Progress Reports and she looked at me kind of funny. She says I'm a fine person and I'll show them all. I asked her why. She said never mind but I ...
February 20, 2014

Math
a 16-foot ladder is leaning against a house and is 2 feet away from the foundation of the house. How high up will the ladder reach?
February 20, 2014

Math, anyone, plz help
What were 14 and 15?
February 20, 2014

Homework help plz( Steve or Reiny)
Did you get a solution to 14 or 15?
February 20, 2014

Is the Cations and Anions right?
Is the Cations and Anions right? Iron (III) Sulfate its F 3+ and SO2- Colbalt (II) Chloride its Co+ and Cl-2 Nickel (II) Chloride its Ni 2+ and Cl-2 Copper (II) Sulfate its CU+ and SO-4 Are these right?
February 19, 2014

History
The correct answer is India.
February 19, 2014

History
Thank you!
February 19, 2014

History
China but when I took the test it said that, that was wrong.
February 19, 2014

History
During the nineteenth century, which of the following countries experienced a decrease in industrial production? A. Britain B. China C. India D. Japan Not sure I think the answer is C.
February 19, 2014

Art
1. This is where an interior designer does most of her work. in a factory at the client's home in an office <<<<<<<<< in a studio 2. When looking at fabrics, an interior designer will focus on these characteristics. shape and form space and color...
February 19, 2014

MATH
Lucy was helping her parents construct a concrete birdbath in her backyard. they had a cone shape and a flattened cylinder. how did they put this birdbath together?
February 16, 2014

science
whats the uses of the element mercury?
January 20, 2014

Mathematics
A man received an invoice for a leaf blower for $478 dated April 17 with sales terms of 4/10 EOM. How much should he pay if he pays the bill on April 29? is it - 478-(478*4/100)= $458.88
December 17, 2013

Mathematics
296 :)
December 17, 2013

Mathematics
Find the amount of increase if 740 is increased by 40%
December 17, 2013

Mathematics
The formula Total cost = Cost + Shipping cost - Holding cost is used to find the total cost of a business asset. The formula can be written in symbols as T=C+S+H. Solve the formula for C, the the cost of the asset. C=
December 17, 2013

Math
One company has $200,000 to distribute in dividends. There are 21,000 shares of preferred stock that earn dividends at $0.70 per share and 80,000 shares of common stock. How much money goes to preferred stockholders?
December 15, 2013

Mathematics
thanks
December 14, 2013

Mathematics
Convert to years, expressed in decimal form to the nearest hundredth. 10 months
December 14, 2013

Mathematics
Find the amount of increase if 480 is increased by 10%
December 14, 2013

math
Thank you
December 14, 2013

Science!
By any chance. Have you figured the questions out?
December 6, 2013

science
Ithank you
November 26, 2013

science
An objects ______ does not change no matter where in the universe it is.
November 26, 2013

science
An objects _________ does not change no matter where in the university
November 26, 2013

math
What are all the 2 numbers thy equal 24
November 21, 2013

Question About Math
So #1 is A and #2 is D?
November 17, 2013

Question About Math
Hello! I have two math questions: 1.) Marcos has 28 coins that are all nickels (n) and dimes (d). The value of the coins is $2.05. Which system of equations can be used to find the number of nickels and the number the dimes? A. n + d = 28 5n + 10d = 205 B. n + d = 28 10n + 5d...
November 17, 2013

Science
What process involves the comparison of rock layers with others in a sequence to determine its age? radioactive decay radiometric dating relative dating absolute dating To determine the most accurate and precise age of Earth's oldest rocks, geologists would use relative ...
October 30, 2013

Math
Thank ya'
October 29, 2013

Math
Help!?! 4x+49<9-x Thank ya ^.^ (^~\' my taco face lol ) (\:D-:) my cookie face lol )
October 29, 2013

History
What is the purpose of government?!?
October 29, 2013

chemistry
A sample of gas in a balloon has an initial temperature of 25\({\rm \, ^{\circ}C}\) and a volume of 1670\({\rm L}\) . If the temperature changes to 82\({\rm \, ^{\circ}C}\) , and there is no change of pressure or amount of gas, what is the new volume, \(\texttip{V_{\rm 2}}{V_2...
October 29, 2013

Algebra /.-
Thanks!
October 23, 2013

Algebra /.-
-4x-23=-107 Help!?!?
October 23, 2013

History
Will you please check my answers? 1. Which of the following is an example of new economic divisions in the European peasantry that began to occur during the fifteenth century? A. Peasants throughout Europe became poorer. B. Peasants living in the Balkans became freer. C. ...
October 21, 2013

science
Explain what causes the tides to change
October 20, 2013

ALGEBRA 1
A nonstop bus ride from the bus station in Atlantic City, New Jersey, to the bus station in Albany, New York, took 6 hours. If the average speeed of the bus was 21 meters per second , what is the distance between the two bus stations, to the nearest kilometer? A. 756 B. 454 C...
October 10, 2013

Algebra 1
For $46, Joel can rent a machine to make novelty buttons to sell at the county fair. The materials cost $0.39 per button. How many buttons must he sell at $1.40 each in order to make a profit. Identify the graph that shows all the possible answers. A: 45, 46, 47, 48....... B: ...
October 10, 2013

Math
In the figure below, points A, B, and C are collinear, and AB and BC are each 6 units long. If the area of ACD is 24 square units, how many units long is the altitude BD? A. 2 B. 4 C. 6 D. 8 E. 12
October 9, 2013

Math
Thank ya' ^.^
October 8, 2013

Math
5(2a + b)-2(3a-5b) Is the answer 4a+15b just checking
October 8, 2013

Algebra 1
You work in the local mailroom at a college. One of your duties is to sort local mail from all of the other mail. You can sort 8 pieces of mail in 10 seconds. How many pieces of mail should you be able to sort in 45 minuets?
October 3, 2013

Math
Help! Plz 3/4(x)=8
September 26, 2013

Social studies (urgh!)
^.^ :P
September 18, 2013

Social studies (urgh!)
Thanks love it!
September 18, 2013

Social studies (urgh!)
What would you draw for the word diverse/diversity?!? Definition: many & different
September 18, 2013

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